L99MH98 datasheet(55/147 Pages) STMICROELECTRONICS

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6.4.6

First SPI access at power-up scenario

•

Frame 1

–

SDI:

◦

Bit 23 = 0 or 1 (read or write command on the OpCode)

◦

Bit 22 = Not used

◦

Bits 21 to 16 = Address of the register to read or write

◦

Bits 15 to 1 = Data to write (if write command was chosen) or all ‘0’ (if read command was

chosen)

◦

Bit 0 = Parity bit

–

SDO:

◦

Bit 23 = 1 (SPI error or RESET event in the previous access)

◦

Bit 22 = GSBN bit (1 = No fault)

◦

Bits 21 to 16 = Address of the STATUS register

◦

Bits 15 to 1 = Data value of the STATUS register

◦

Bit 0 = Parity bit

Figure 38. First SPI access at power-up scenario

At power-up the status register

value is with bit15 set to ‘1’

After the end of first valid SPI

access the bit 15 of status

Data on SDO during first access after power-up will be

always the value of STATUS register

SPI Error or RESET

In this case 1 means: reset before this access

6.4.7

Access while an internal fault happens scenario

•

Frame n

–

SDI:

◦

Bit 23 = 0 or 1 (read or write command on the OpCode)

◦

Bit 22 = Not used

◦

Bits 21 to 16 = Address of the register to read or write

◦

Bits 15 to 1 = Data to write (if write command was chosen) or all ‘0’ (if read command was

chosen)

◦

Bit 0 = Parity bit

–

SDO:

◦

Bit 23 = 0 (no SPI error or RESET in the previous access)

◦

Bit 22 = GSBN bit (1 = No fault)

◦

Bits 21 to 16 = Address of the register selected in the previous frame (n-1)

◦

Bits 15 to 1 = Data value of the register selected in the previous frame (n-1)

◦

Bit 0 = Parity bit

L99MH98

Serial peripheral interface (SPI)

DS14611 - Rev 3

page 55/147

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